[ubuntu] Unity displays the wallpaper after an unresponsive delay

view story

http://ubuntuforums.org – Since I have upgraded from 12.10 to 13.04 (a few weeks ago), I have been having some annoying behaviour after login. First of all, the wallpaper does not come on, instead the login screen is continued to be displayed as a background, together with slow appearing top panel and Unity launcher. Secondly, the UI is unresponsive for a minute or so, while there is a lot of disk activity. Switching to console (Ctrl+Al+F1) and running 'top', I see ubuntuone sync deamon (and sometimes gnote which is set up to open a note at login) are taking some CPU time (sometimes 90+%). After a while, it turns to no (Hardware)